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The anterior thoracic nerve from the C5 to C8 roots innervates the pectoralis major and minor, and the thoracodorsal nerve from C6 to C8 roots innervates the latissimus dorsi muscle. The axillary nerve is formed by fibers of the C5 to C6 roots which go through the posterior cord of the plexus and innervate the deltoid and teres minor muscles, as well as part of the skin of the lateral shoulder.
it is served by the thoracodorsal nerve. latissimus dorsi. this structure is formed from the anterior divisions of the upper and middle trunks of the brachial plexus. it contains neurons from anterior rami of c5 c6 c7 and it gives rise to the musculocutaneous nerve as well as part of the median nerve.